(19)
(11) EP 0 155 087 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.06.1988 Bulletin 1988/24

(43) Date of publication A2:
18.09.1985 Bulletin 1985/38

(21) Application number: 85300987

(22) Date of filing: 14.02.1985
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 12.03.1984 US 588921

(71) Applicant: BAXTER TRAVENOL LABORATORIES, INC.
 ()

(72) Inventors:
  • Oppenlander, Jon E.
     ()
  • Koball, Bruce, R.
     ()
  • Shackelford, Carl L.
     ()
  • Karne, Benn
     ()

   


(54) Hand-held pipette with disposable capillary


(57) A hand-held manually operated pipette having an adjustable plunger stroke and calibrated electronic digital volumetric display (106) draws-up and dispenses viscous, dense or high vapor pressure liquids by means of an easily replaced, disposable integral, positive displacement type plunger tip (10) and capillary (11) assembly. The pipette in another form utilizes a disposable air displacement capillary. The plunger adjustably strokes to a first stop (51) in a first mode for calibration or sample draw-up and dispensing with the volume of pipette liquid contents continuously displayed. In a second mode an over-travel arrangement enables the plunger shaft (23) to stroke beyond the first stop to permit collet type attachment and ejection of the integral plunger tip and capillary for positive disptacement service or to eject an air displacement capillary.






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